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This paper deals with the assessment of track deterioration using a train-track interaction model. While modelling a train-track system a balance has to be found between the complexity and effort of the model on the one side and the needs for the assessment. The choice of assessment criteria are decisive for the given task. For an optimization of the track and its components simple assessment criteria are needed to allow for a variation of parameters. The paper describes the generalized process for track assessment and optimization and gives examples for specific members.